scholarly journals Study on Temperature Variation and Pore Structure Evolution within Coal under the Effect of Lilquid Nitrogen Mass Transfer

ACS Omega ◽  
2021 ◽  
Author(s):  
Bo Li ◽  
Laisheng Huang ◽  
Xiaoquan Lv ◽  
Yongjie Ren
Keyword(s):  
Mass Transfer ◽  
Pore Structure ◽  
Temperature Variation ◽  
Structure Evolution

scholarly journals Modeling of Forced Flow-thermal Gradient CVI: Effects of Control Parameters and Processing Schemes on a Densification

2020 ◽  
Author(s):  
Pengfei WANG ◽  
Shengfeng Luo ◽  
Hui ZHANG ◽  
Song ZHANG ◽  
Lili ZHENG
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Pore Structure ◽  
Temperature Control ◽  
Thermal Gradient ◽  
Forced Flow ◽  
Structure Evolution ◽  
Control Parameters ◽  
Porosity Distribution ◽  
Channel Temperature

Abstract A two-channel temperature-control infiltration reactor aiming at fabricating thicker and more uniform composites was designed. Unsteady numerical simulations containing hydrodynamics, mass transfer, heat transfer and pore structure evolution were carried out. By analyzing the effects of concentration, velocity and temperature on the porosity distribution, different densification schemes were proposed and compared. Results show that a preform of thickness 0.04 m and initial porosity 0.8 can be densified to a uniform and compact one with the maximum porosity of 0.1 within 300 hours through the three-step densification scheme. This scheme not only assures a low and uniform porosity over the whole preform but also avoids the huge pumping pressure which may cause the preform cracking.

Limestone Characterization to Model Damage from Acidic Precipitation:  Effect of Pore Structure on Mass Transfer

1996 ◽  
Vol 30 (7) ◽  
pp. 2202-2210 ◽  
Author(s):  
Steve D. Leith ◽  
Michael M. Reddy ◽  
W. Fred Ramirez ◽  
Michael J. Heymans
Keyword(s):  
Mass Transfer ◽  
Pore Structure ◽  
Acidic Precipitation ◽  
Precipitation Effect

Pore structure evolution in silica gel during aging/drying II. Effect of pore fluids

1992 ◽  
Vol 142 ◽  
pp. 197-207 ◽  
Author(s):  
Pamela J. Davis ◽  
C. Jeffrey Brinker ◽  
Douglas M. Smith ◽  
Roger A. Assink
Keyword(s):  
Pore Structure ◽  
Silica Gel ◽  
Structure Evolution ◽  
Pore Fluids

THE RATE OF ADSORPTION OF SOME LOW BOILING GASES ON A MODIFIED SARAN CHARCOAL

1955 ◽  
Vol 33 (2) ◽  
pp. 344-351 ◽  
Author(s):  
J. R. Dacey ◽  
D. G. Thomas
Keyword(s):  
Activation Energy ◽  
Pore Structure ◽  
Temperature Variation ◽  
New Method ◽  
Adsorption Experiment ◽  
Vinylidene Chloride ◽  
Adsorption Of Nitrogen

The pyrolysis at 300 °C. of vinylidene chloride monomer adsorbed on Saran charcoal alters the pore structure of the charcoal so that low boiling gases such as nitrogen are adsorbed slowly. The rates of adsorption of nitrogen, argon, and methane have been measured. They were found to vary with pressure and temperature, and from the temperature variation an activation energy may be calculated. A new method of determining this energy is described which involves changing the temperature during only one adsorption experiment.

Pore Structure Evolution of Cemented Paste Backfill Observed with Two-Dimensional NMR Relaxation Correlation Measurements

2021 ◽  
Vol 60 (36) ◽  
pp. 13253-13264
Author(s):  
Neil Robinson ◽  
Razyq Nasharuddin ◽  
Ganhua Luo ◽  
Andy Fourie ◽  
Einar O. Fridjonsson ◽  
...  
Keyword(s):  
Pore Structure ◽  
Nmr Relaxation ◽  
Structure Evolution ◽  
Two Dimensional ◽  
Cemented Paste Backfill ◽  
Paste Backfill

Pore structure evolution during the coke graphitization process in a blast furnace

2020 ◽  
Vol 27 (9) ◽  
pp. 1226-1233
Author(s):  
Hao-bin Zhu ◽  
Wen-long Zhan ◽  
Zhi-jun He ◽  
Ying-chang Yu ◽  
Qing-hai Pang ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Pore Structure ◽  
Structure Evolution
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